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Effect of Straw, Ash, and Tillage on Dissipation of Imazaquin and Imazethapyr

Published online by Cambridge University Press:  12 June 2017

C. Dale Monks  and
Philip A. Banks
C. Dale Monks
Affiliation:
Dep. Ext. Agron., Univ. Georgia, Athens, GA 30602
Philip A. Banks
Affiliation:
Dep. Agron., Univ. Georgia, Athens, GA 30602
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Abstract

Experiments were conducted on a Cedarbluff silt loam and a Cecil sandy loam to determine dissipation of imazaquin and imazethapyr as influenced by burning small-grain straw and tillage prior to soybean planting. Corn bioassay detection limits for imazaquin and imazethapyr in the Cedarbluff silt loam were 2.5 to 30 and 5 to 40 ppbw, respectively. Bioassay detection limits for imazaquin and imazethapyr in the Cecil sandy loam were 2.5 to 20 and 10 to 40 ppbw, respectively. Imazaquin and imazethapyr activity was not detectable in soil by 110 to 152 d after treatment. Imazethapyr dissipation was not affected by burning or tillage in the Cedarbluff silt loam and dissipated more slowly in 1989 than imazaquin. Imazaquin dissipation in the Cedarbluff silt loam in 1988 was slower in burned plots than in nonburned plots but was not affected by burning in 1989. No differences were observed between imazaquin and imazethapyr dissipation in the Cecil sandy loam and neither burning or tillage influenced their rate of dissipation in either year. No-till-planted cotton was injured at both locations by imazaquin and imazethapyr that had been applied the previous year.

Keywords

Imazaquin, 2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-3-quinolinecarboxylic acidimazethapyr, (±)-2-[4,5-dihydro-4-methyl-4-(1-methylethyl)-5-oxo-1H-imidazol-2-yl]-5-ethyl-3-pyridinecarboxylic acidcorn, Zea mays L. ‘Pioneer 3369A’cotton, Gossypium hirsutum L. ‘Coker 208’, ‘Stoneville 825’soybean, Glycine max (L.) Merr. ‘Braxton’, ‘Duocrop’Bioassaycottoncrop injurypersistenceHordeum vulgareTriticum aestivum
Type
Soil, Air, and Water
Information
Weed Science , Volume 41 , Issue 1 , March 1993 , pp. 133 - 137
Copyright
Copyright © 1993 by the Weed Science Society of America 

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References

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